How do I eliminate blur and lining?

Camera: Panasonic TM300 32GB memory. Used to record subjects using sign language. Video during auto focus and manual focus results in video output of the hands & arms looking blurred and/or being lined similar in appearance to moving your hand back and forth very rapidly in front of your face. Not a motion stability issue due to camera shake as the camera is on a tripod. How may I prevent such output? My software is Sony Vegas 9 Pro for taking the AVCHD files into computer for conversion to any format. But no matter the output format the same issue arises.

Re-typing response as it appears my original didn't make it through.Thanks will follow your advice. I believe I filmed in bright light but you never know so will give that attention. Sports setting, I do think i tried that but don't really remember if I did or not so will focus on that as well. THANKS for taking the time to respond.

Oddly enough, I've done all these things with little positive effect. I'm beginning to think the problem may be that Vegas 9 Pro or its settings. Because now when I convert a video from AVCHD to any other format, Camtasia Studio runs it very slowly, Ulead Studio X2 runs fine except the blurring and lining is still there, slightly less pronounced. Same t6hign with Quicktime and DIVRX players. But when I run video not touched by Vegas 9 Pro, they are smooth and fault free.

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